Hoshizaki and Wilson| Dryopteris caucasica | ||
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Etymology
Caucasica means from the Caucasus, the region between the Black and Caspian seas.
Description
Rhizome: short-creeping, forming clumps of a few fronds.
Frond: 100 cm high by 20 cm wide, deciduous, monomorphic, blade/stipe ratio: 3:1. Stipe: grooved, scales sparse, pale brown, triangular to ovate-lanceolate, up to 2 cm, vascular bundles: 3-7 in a c-shaped pattern. Blade: 2-pinnate, ovate-lanceolate to elliptic, narrow, herbaceous to somewhat leathery, linear to ovate scales below, absent above. Pinnae: catadromous; costae grooved above, continuous from rachis to costae; margins entire to lobed to crenate with paired teeth; veins free, forked. Sori: round, in 1 row between midrib and margin, indusium: reniform, white until shrivelling, at a sinus, sporangia: very dark. Culture
Habitat: forests in montane regions.
Distribution: Caucasus, Crimea, Turkey, northwestern Iran.
Hardy to -25�C, USDA Zone 5.
Synonyms
Aspidium affine Fisch. & Mey. Aspidium caucasicum A. Braun Dryopteris filix-mas ssp. caucasica (A.Braun) Askerov |
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Notes
Compare to D. filix-mas, of which it is one parent. Distinguished by the narrower pinnae with more separated pinnules and more deeply serrate margins
Compare to D. filix-mas, of which it is one parent. Distinguished by the narrower pinnae with more separated pinnules and more deeply serrate margins
Dryopteris caucasica. Fertile frond; sori are confined to upper half except for the pinnatifid apex. �Photo: Tom Stuart |
Dryopteris caucasica. �Illustration from The Cultivated Species of the Fern Genus Dryopteris in the United States, Barbara Joe Hoshizaki and Kenneth A. Wilson, American Fern Journal, 89, 1, (1999), with permission. |
Dryopteris caucasica. Vascular bundles at the stipe base: two primary at the stipe front, five others in varying sizes in a c-shape. The smaller ones are not visible without a hand lens. �Scan: Tom Stuart |
